Norwegian researchers develop UV LEDs built on graphene

Researchers at the Norwegian University of Science and Technology's (NTNU) Department of Electronic Systems, led by professors Helge Weman and Bjørn-Ove Fimland, have succeeded in building UV LEDs by growing AlGaN nanowires on graphene. "We've shown that it's possible, which is really exciting," says PhD candidate Ida Marie Høiaas, who has been working on the project with PhD candidate Andreas Liudi Mulyo.

A layer of graphene placed on glass forms the substrate for the researchers' new diode that generates UV light. Researchers then grew nanowires of AlGaN on the graphene lattice, using molecular beam epitaxy. This was conducted in Japan, where the NTNU research team collaborates with Katsumi Kishino at Sophia University in Tokyo.

Italian researchers develop a graphene-based OFET for future OLED and OLET displays

Researchers from Italy's ISOF-CNR, University of Naples "Federico II" and Università di Modena e Reggio Emilia have developed new organic n-type FET transistors (OFETs) based on CVD graphene sheets. The researchers say that the new process and materials they used can enable flexible, transparent and short-channel OFETs - which could be used in the future for OLED or OLET (organic light emitting transistor) displays.

ISOF CNF CVD graphene OFET structure photo

To create the new transistors, the researchers used thermally evaporated thin-films of PDIF-CN2 (a perylene diimide derivative) as the the organic semiconductor for the active channel of the transistor with the single-layer CVD graphene (grown at Italy's IIT institute) as the electrode material. The final device architectures have been fabricated via Electron-Beam-Lithography (EBL) and Reactive Ion Etching (RIE).

Turkish defense company announces next-gen graphene-based OLED displays

Aselsan, a leading Turkish defense company that produces military radios and defense electronic systems for the Turkish Armed Forces, has reportedly designed graphene-based OLED screen prototypes with what is said by the Company to be the highest pixel resolution yet achieved.

Turkish defense giant develops graphene-based OLED displays image

The project produced monochrome miniature screens that can function without backlighting, and the results of the graphene-based OLED screen development effort were presented at the Eurodisplay Conference in Berlin.

ETRI researchers develop a fully-operational 40x40 mm flexible OLED using pixelated transparent graphene electrodes

One year ago, researchers from the Korea-based ETRI (Electronics and Telecommunications Research Institute) demonstrated an 370x470 mm OLED array that use graphene transparent electrodes.

ETRI graphene-electrode OLED prototype, Apr 2017

At this year's SID DisplayWeek trade show, ETRI researchers will demonstrate a flexible OLED panel that use a transparent graphene electrode. The researchers developed a "fully operational" 40x40 mm OLED panel that uses a pixelated graphene film as electrodes.

UK researchers demonstrate a viable graphene-based OLED encapsulation solution

OLED displays are very sensitive to oxygen and moisture, and the need to protect the displays is one of the major challenges of this next-generation display technology. First generation OLED displays were protected with a glass barrier, but glass is not easily flexible and so cannot be used in flexible OLEDs. Flexible OLEDs are today encapsulation with a thin-film encapsulation layer made from both organic and in-organic materials, and companies are searching for better OLED encapsulation technologies.

Graphene encapsulation research, CPI 2017

Graphene is the world's most impermeable material, and so the idea of using graphene as a barrier layer for OLED has been around for a while. In 2015 the UK launched a collaboration project called Gravia to develop graphene-based encapsulation, and the project's team has now reported their results.